Ring Oscillator GaN Power Converter for High-Frequency Switching
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Solution Overview
Problem
Existing high-frequency power converters are large in size and inefficient, particularly when built into integrated circuits for applications like autonomous cars and space equipment, due to limitations in externally controlled signals and transistor efficiency, and the challenges of using wide bandgap devices like GaN, which increase switching losses and electromagnetic interference.
Innovation Solution
A power converter using a three-phase or three-stage ring oscillator configuration with GaN technology, where the ring oscillator generates its own high frequency, reducing ripple and increasing current and power capacity, and allowing for efficient operation at high frequencies with small size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If high switching frequency is used to reduce converter size and increase power density, then volume and weight are reduced, but switching losses and electromagnetic interference increase
Solution Approach 1:
The patent employs periodic switching action through carefully timed gate signals that create non-overlapping conduction intervals for the GaN devices. This periodic control allows the converter to operate at high frequencies while managing switching losses through precise timing coordination of the switching devices.
Solution Approach 2:
The patent changes the operating parameters by utilizing wide bandgap GaN materials with different breakdown voltages and conduction characteristics. By selecting specific GaN device parameters (breakdown voltage, on-resistance) and operating them in specific modes, the converter achieves high frequency operation with reduced losses compared to traditional silicon devices.
2Volume of moving object
If high switching frequency is used to reduce converter size, then volume is reduced, but electromagnetic interference increases
Solution Approach 1:
The patent converts the potentially harmful high-frequency switching transients into beneficial operation by using the fast switching capability of GaN devices to achieve precise voltage conversion. The high dV/dt and dI/dt that could cause EMI are instead utilized to achieve compact magnetic component design and high power density, with EMI managed through proper layout and shielding.
3Productivity
If wide bandgap devices like GaN are used to increase switching speed and reduce size, then switching frequency and power density are improved, but switching losses and control complexity increase
Solution Approach 1:
The patent implements self-service operation where the converter automatically regulates its switching frequency and duty cycle based on the input voltage, output load, and desired output voltage. The GaN devices self-adjust their conduction intervals through the inherent properties of the circuit topology and feedback control, eliminating the need for complex external control circuitry and reducing switching losses through optimal automatic operation.
4Adaptability or versatility
If externally controlled power converters are used, then frequency of operation can be regulated, but design complexity and size increase
Solution Approach 1:
The patent implements self-service operation where the converter automatically regulates its switching frequency and duty cycle based on the input voltage, output load, and desired output voltage. The GaN devices self-adjust their conduction intervals through the inherent properties of the circuit topology and feedback control, eliminating the need for complex external control circuitry and reducing switching losses through optimal automatic operation.
Data Source
AI summary
A switching circuit comprises a main switch element having a gate as a control input; and a ring oscillator connected as a driver circuit to the gate to drive the main switch via the gate. The basic circuit is used to build various components which have the property that they can work at very high frequencies.